The Nine-Day War (Arabic: أربع سنوات يوم الحرب, French: Neuf jours guerre) was an attrition war fought between North Syria against Iraq and Syria from September 19 to September 28, 2014.
Following the Battle of Western Iraq in spring of 2013, no serious efforts were made between North Syria, Iraq and Iran toward peace negotiations. Iraqi president Fuad Masum made it plain that the use of force is the only thing that would end North Syrian interference to Iraq's political and military wishes, and on September 18 at 11:30 PM Baghdad time, Masum declared an attrition war against North Syrians.
The Soviets, once again became involved by supplying their South Syrian an Iraqi allies. The Soviet Air Force carried out airstrikes in western Iraq to help the Iraqi forces route North Syrians.

On September 21, Syrian president Bashar al-Assad decided to use this as an opportunity to regain lost territory from the Syrian Civil War, as well the Levantine War and declared war against North Syria, opening up a Syrian Front and an Iraqi Front.

On the Iraqi Front, the North Syrians and Iraqis engaged in artillery duels along the North Syrian-Iraqi border. The war was also characterized by night raids, aerial assaults and sabotage missions. While the North Syrians performed small-scale incursions, the Iraqis prepared for bigger battles.
On the Syrian Front, the North Syrians and Syrians engaged in mostly armored battles.

In the end, a U.N.-mandated cease fire was signed in Beirut, Lebanon thus ending the war. No border changes were made.